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Figure 1
Complete the ray diagram shown in Figure 1, given that the critical angle for air-glass pair is .
Complete the ray diagram shown in Figure 1, given that the critical angle for air-glass pair is $i_c = 42^\circ$.
Draw: ray diagram completing the path of light ray incident on the glass-air interface at critical angle 42°

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From ISC 2018 Specimen Physics Paper 1, question 1(B)(v).